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By now, there are lots of things about climate change you probably think you know, like how carbon dioxide could lead to a warmer atmosphere or how melting ice could raise sea levels.
現在，有很多關于氣候變化的事情你可能認為你知道，像二氧化碳如何導致大氣變暖或者融化的冰如何提高海平面。
Those ideas are more right than wrong, but the truth is it's complicated.
這些想法是正確的，但事實卻是復雜的。
While certain natural functions need CO2, too much could throw off the planet's carbon-cycle balance.
雖然某些自然的功能需要二氧化碳，過多可能會影響地球的碳循環平衡。
A 2014 study, for example, showed plants can absorb more CO2 than we thought,about 1 trillion tons. And more carbon dioxide can even help plants grow.
例如，一項2014年的研究表明，植物吸收的二氧化碳比我們想象的要多，大約有1萬億噸。更多的二氧化碳甚至可以幫助植物生長。
But too much atmospheric CO2 can ultimately hinder plant growth because it can influence weather patterns, like longer droughts.
但大氣太多的CO2最終會阻礙植物的生長，因為它會影響天氣模式，比如更長的干旱。
Although human activity is driving the increase in CO2, we might only partly contribute to other climate change phenomena.
雖然人類活動正在推動二氧化碳的增加，我們可能只是部分地促進了其它氣候變化現象。
In a recent study, scientists found things that happen naturally, like temperature flux and solar radiation, make up as much as half of the overall decline in sea ice.
在最近的一項研究中，科學家發現自然發生的事情如溫度通量和太陽輻射，構成了海冰整體下降一半。
So, sea ice melt isn't entirely our fault, but we do still contribute at least half and that's a problem.
因此，海冰融化并不完全是我們的錯，但我們仍然貢獻至少一半，這是一個問題。
Sea ice reflects sunlight, which keeps Earth cool. Less of it means the dark ocean can absorb more light, which heats up the planet.
海冰反射陽光使地球保持涼爽。它的減少意味著深藍的海洋可以吸收更多的陽光使地球變熱。
But melting sea ice doesn't raise sea levels. Research attributes that to land ice, from mountain glaciers and ice sheets that flow into the ocean.
但是融化的海冰并不能提高海平面。研究發現是流入海洋的高山冰川和冰原使海平面上升。
Think of it like adding water to an already full glass,eventually it will overflow.
想想，就好像是把水倒在已經滿了的杯子里，最終它會溢出來。
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